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Lewi,
I was missing my ground straps as well. I installed a computer controlled fuel injection system, and I found that for some strange reason, it ran much better in the rain!
Turns out that there was enough difference in the ground voltages that the computer wasn't getting a good throttle position reading.
Anything which is grounded in the cab like turn signals, instruments, and your radio can do squirrely things. I had my marker lamps coming on when my turn signals were on (and not with the headlights). I had one brake light working but not the other, etc, etc.
c10s point is a valid one. There are electrical things in your cab that need a good ground. It's a matter of a few minutes to reconnect your grounding straps.
Just to be doubly sure (because of my fuel computer) I ran a second ground wire from the grounding post at the radiator support to a second grounding point on the cab. Computer runs like a champ now.
Brian
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